| A connection between the subnets behind the gateways <b>moon</b> and <b>sun</b> is set up. |
| The authentication is based on trustworthy public keys stored as <b>CERT</b> |
| resource records in the Domain Name System (DNS) and protected by <b>DNSSEC</b>. |
| <p/> |
| Upon the successful establishment of the IPsec tunnel, the updown script automatically |
| inserts iptables-based firewall rules that let pass the tunneled traffic. |
| In order to test both tunnel and firewall, client <b>alice</b> behind gateway <b>moon</b> |
| pings client <b>bob</b> located behind gateway <b>sun</b>. |
